For you I'd take a lot more than 2,000 mg of vit C unless that's already causing loose stools/diarrhea. Most people need a lot more than that when they're sick and I found that if I took a ton--consider closer to 20,000 mg, maybe more, the amount needed is pretty individual--it was enough to really reduce the symptoms of my son's colds (when he was exclusively breastfed, when he started solids I had to give vitC to him directly). You may also want to supplement either zinc or D for yourself--even in fairly high amounts, it's not likely to change the amount in your milk but it wouldn't cause problems for your LO and the better you support yourself, the sooner your body produces antibodies to this. I can't advise how to modify the meds your LO's on. I don't have any experience with nebulizers.
I can say that a fair number of people have good results treating ear infections with structural work--a chiropractor or someone who does cranial-sacral if you can find one, but at-home massage helped with my son's ear infection last year. Long strokes behind the ear, starting at the top of the ear down, through the dip behind the earlobe, then down to the collarbone. Also long strokes starting at various points in the middle of the face--forehead, sides of the nose, under the nose and at the chin--each time out to the edge of the face, then turn down and stroke all the way to the collarbone. And to help the eustachian tubes drain, gentle tugs on the earlobe down and back.
Onion juice in the ear also is supposed to help, my son just didn't want any liquids at all in his ear so I have no idea if what little I got in did anything.
For a cough my daughter had this past spring, our DO did, and recommended I do, a rib-lifting exercise (not sure if that's a great description). I was to hold her torso near the bottom of her ribs and lift her up--not squeezing or anything, just gently pick her up and set her down, then move my hands up a rib or so and repeat, and do that up to about her armpits. She coughed more afterward for the remainder of the day but it seemed like it was finally productive, her lungs were getting cleared out better, and it seemed helpful for her getting well. My daughter's older, she's 6, but it's pretty gentle.
Hope your LO and you start feeling better soon.